When I worked at the dealer back in the 70s most people thought they were just nosy engines , the 1600 , and 2.0 pinto engine had to have valve adjustment also , but most were never done , the bronco II up until 85 had the 2.8 also , next door neighbor had one and believed his dumb buddy's that the lifters were going bad and the engine was going to blow up any day , show him how to adjust the valves and do it every 15k miles , not every 60k , I adjust mine every 10k ,